Remember how great it was back before your iPod ruined the planet, when the Laurentide Ice Sheet scoured "virtually all life from the surface of the land"?

Maine beaches continue to push inland | SeacoastOnline.com

The Laurentide Ice Sheet — the last major ice sheet that extended from northern Canada to southern New England — reached its maximum about 25,000 years ago, scouring virtually all life from the surface of the land and was so heavy (it was 1-2 miles thick!) that it depressed the underlying continental crust.
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Beaches have a natural year-long cycle of erosion in the winter (due to harsh winter waves) and sand accretion (deposition onto the beaches) in the summer.